diff --git a/requirements/tools.txt b/requirements/tools.txt
index 8378169e4..9432399a7 100644
--- a/requirements/tools.txt
+++ b/requirements/tools.txt
@@ -1,4 +1,4 @@
-mypy<=1.19.1;
+mypy<=2.1.0;
 # while flake8 5.x have issues with Python 3.12, flake8 6.x requires Python >= 3.8.1,
 # so 5.x should be kept in order to stay compatible with Python 3.7/3.8
 flake8>=7.3.0,<8
diff --git a/slack_sdk/models/blocks/block_elements.py b/slack_sdk/models/blocks/block_elements.py
index 813f2ec5e..a238a865a 100644
--- a/slack_sdk/models/blocks/block_elements.py
+++ b/slack_sdk/models/blocks/block_elements.py
@@ -66,7 +66,7 @@ def parse(cls, block_element: Union[dict, "BlockElement"]) -> Optional[Union["Bl
                 d = copy.copy(block_element)
                 t = d.pop("type")
                 for subclass in cls._get_sub_block_elements():
-                    if t == subclass.type:
+                    if t == getattr(subclass, "type", None):
                         return subclass(**d)
                 if t == PlainTextObject.type:
                     return PlainTextObject(**d)
diff --git a/slack_sdk/socket_mode/aiohttp/__init__.py b/slack_sdk/socket_mode/aiohttp/__init__.py
index 936e7c9a5..761683020 100644
--- a/slack_sdk/socket_mode/aiohttp/__init__.py
+++ b/slack_sdk/socket_mode/aiohttp/__init__.py
@@ -246,7 +246,7 @@ async def receive_messages(self) -> None:
                                 self.logger.debug(
                                     f"Received message "
                                     f"(type: {message_type}, "
-                                    f"data: {message_data}, "
+                                    f"data: {repr(message_data)}, "
                                     f"extra: {message.extra}, "
                                     f"session: {session_id})"
                                 )